Question: Which is the authority for the congress of the Communist Party of the Soviet Union?
Paraphrase: What is the authority for the Soviet Union Communist Party Congress?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q79854 wdt:P797 ?obj . ?obj wdt:P31 wd:Q2495862 } 
Answer: Congress of the Communist Party of the Soviet Union